CS5535 datasheet(343/555 Pages) NSC

343 / 555 page

Revision 0.8

343

www.national.com

PIC Register Descriptions (Continued)

5.9.2.8

Operation Command Word 3 (PIC_OCW3)

PIC_OCW2 Bit Descriptions

Bit

Name

Description

7:5

ROT_EOI

Rotate/EOI Codes.

000: Clear rotate in Auto EOI mode.

100: Set rotate in Auto EOI mode.

001: Non-specific EOI.

101: Rotate on non-specific EOI command.

010: No operation.

110: Set priority command (bits [2:0] must be valid).

011: Specific EOI (bits [2:0] must be valid.

111: Rotate on specific EOI command (bits [2:0] must be valid)

4:3

Write to 0. Write to 00 to write OCW2 (rather than OCW3 or ICW1). (See Section 5.9.2

"PIC Native Registers" on page 339.)

2:0

IRQ

IRQ Number (000-111).

I/O Port

Master: 020h

Slave:

0A0h

Type

Reset Value

00h

PIC_OCW3 Register Map

RSVD

SP_MASK

RSVD

REG_READ

PIC_OCW3 Bit Descriptions

Bit

Name

Description

RSVD

Reserved. Write to 0.

6:5

SP_MASK

Special Mask Mode. The internal SMM Mode bit can be set or cleared using this 2-bit

field.

0x: No change to the internal SMM Mode bit.

10: Clears the internal SMM Mode bit (i.e., value of SMM Mode bit = 0). (Default after

initialization.)

11: Sets the internal SMM Mode bit (i.e., value of SMM Mode bit = 1).

While the internal SMM Mode bit is 1, interrupt blocking by priority is disabled, and only

the Interrupt Mask Register (OCW1) is used to block interrupt requests to the CPU.

While the internal SMM Mode bit is 0 (the default), an unmasked IRQ must also be of

higher priority than the IRQ of the currently running interrupt service routine. Regard-

less of the setting of this bit, the IRQ priority is still used to arbitrate among multiple

allowed IRQ requests at the time of an Interrupt Acknowledge access from the CPU.

4:3

Write to 01. Write to 01 to write OCW3 (rather than OCW2 or ICW1). (See Section

5.9.2 "PIC Native Registers" on page 339.)

RSVD

Reserved. Write to 0. (Poll Command at this address is not supported.)

CS5535 数据表(PDF) 343 Page - National Semiconductor (TI)

CS5535 数据表(HTML) 343 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表下载

链接网址

CS5535 数据表(PDF) 343 Page - National Semiconductor (TI)

CS5535 数据表(HTML) 343 Page - National Semiconductor (TI)

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

数据表 下载

链接网址

数据表下载